The firearms appear to be a dead loss. The grenade launchers (”knee mortars”) might, MIGHT be salvageable to demilitarized relic status. Some of the swords and bayonets might be restored; but only to the lowest grade of collector items.
As a collector (even though not of WWII Japanese items) it makes me sad.
...makes me Sad
A little cosmolene,,,
Call me in the morning.